变压器的主要技术参数不包括（ ）

屋面最大汇水面积不宜超过A．100㎡ B．150㎡ C．200㎡ D．300㎡

单项选择题屋面最大汇水面积不宜超过

Self-introduction is a monologue, in which you're not r...

判断题Self-introduction is a monologue, in which you're not required to consider the emotion and responses of the audience.

下列关于比转数的叙述，错误的是( )。A.比转数大小可以反映叶轮的构造特点B.叶片泵可以根据比转数大小进行分...

单项选择题下列关于比转数的叙述，错误的是( )。